EP0782060B1 - Régulateur de position contrôlé par microprocesseur - Google Patents

Régulateur de position contrôlé par microprocesseur Download PDF

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Publication number
EP0782060B1
EP0782060B1 EP96117147A EP96117147A EP0782060B1 EP 0782060 B1 EP0782060 B1 EP 0782060B1 EP 96117147 A EP96117147 A EP 96117147A EP 96117147 A EP96117147 A EP 96117147A EP 0782060 B1 EP0782060 B1 EP 0782060B1
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EP
European Patent Office
Prior art keywords
valve
function
position regulator
valve opening
plant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP96117147A
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German (de)
English (en)
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EP0782060A1 (fr
Inventor
Rainer Dr. Lange
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Schubert und Salzer Control Systems GmbH
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Schubert und Salzer Control Systems GmbH
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Publication of EP0782060A1 publication Critical patent/EP0782060A1/fr
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Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D7/00—Control of flow
    • G05D7/06—Control of flow characterised by the use of electric means
    • G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
    • G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
    • G05D7/0635—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on throttling means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/08—Servomotor systems incorporating electrically operated control means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/0318—Processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7758—Pilot or servo controlled
    • Y10T137/7759—Responsive to change in rate of fluid flow
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7758—Pilot or servo controlled
    • Y10T137/7761—Electrically actuated valve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86389—Programmer or timer

Definitions

  • Positioners are used to control valves in systems used to adjust the stroke or opening h of the control valve accordingly to position a target. This requirement exists usually in a certain desired flow rate Q. Disturbing disturbance and friction forces in the flow should be largely switched off. A certain one Opening h of the valve is thus a certain flow rate Q assigned. This relationship Q (h) usually becomes an operating characteristic called.
  • a manipulated variable w is called electrical Current signal fed into the positioner and with the current opening or stroke position h of the valve compared.
  • the pneumatic actuator of the valve a pneumatic or mechanical actuating force is supplied until the actuating and controlled variable (Target / actual value) match.
  • the most common positioners are mostly electromechanical Principles built up.
  • the stroke h or the opening of the The valve is mechanically detected, e.g. via a lever linkage, and returned to the positioner.
  • valve opening h is in an electrical Resized, e.g. through a potentiometer, and in suitably, e.g. about the processor software with which Benchmark compared.
  • the command variable w is specified as a current or voltage signal, for example from a process computer or process controller, which is the manipulated variable w, i.e. the signals for control of the valve via one in the microprocessor-controlled Circuit of the computer-formed algorithm (calculation method) calculated. Processing the signals as a guide and The controlled variable takes place via a microprocessor-controlled circuit of the positioner. Finally, the stroke achieved h detected and via a potentiometer or a non-contact working measuring system traced.
  • each valve has a specific valve characteristic curve K v (h) due to its design, which however changes to the operating characteristic curve Q (h) depending on the resistances and operating states of the system in which the valve is installed.
  • the operating characteristic Q (h) of the system should show the flow Q as a linear function of the stroke h for all operating conditions.
  • the object of the present invention is simple the control accuracy of a control system installed in a system to improve a system.
  • this object is achieved in that a Non-linearity between the control signal (w) and the valve opening (h) is generated in such a way that linearity between control signal (w) and flow rate (Q).
  • the (non-linear) operating characteristic Q (h) of the system is determined and converted into a linear function Q (w).
  • This can be activated by adding a non-linear mechanical or electronic transmission element for Positioners (valve actuators) ensure that the positioner (6) to control the valve (1) predetermined Control signal (w) converted into such a valve opening (h) becomes that a linear function Q (w) arises.
  • the operating characteristic Q (h) of the system can be different Be determined, for example, simply by direct Measurement of the flow rate Q as a function of the valve opening h.
  • Another type of determination is carried out by measuring the inlet pressure p 1 upstream of valve 1 and the outlet pressure p 2 downstream of valve 1 as a function of valve opening h, with this pressure difference including the values from the characteristic curve K v (h ) the operating characteristic Q (h) of the system is calculated.
  • This procedure has the advantage that the determination of the operating characteristic Q (h) of a system can be automated using a computer, so that the system adjusts itself to the operating conditions and / or the control valve used.
  • the method according to the invention is based on an example as well as devices for its implementation described in more detail.
  • the system according to FIG. 1 consists of a valve 1, a heat exchanger 2 as a consumption resistor and a pump 3 which effects the flow circuit of the medium in the system.
  • the valve 1 is connected to a positioner 6, which in turn is preceded by a microprocessor or process controller 5 for its control.
  • Pressure sensors 7 and 8 are arranged upstream and downstream of the valve 1 in order to determine the pressures p 1 and p 2 .
  • the temperature T is to be regulated in a container 4. This is recorded by the process computer 5, there: compared with a target value Ts and the control signal w for the valve 1 is determined. This control signal w is fed to the positioner 6 of the valve 1 , which is equipped with a microprocessor or computer circuit (FIG. 3).
  • the positioner 6 includes a stroke sensor according to FIG. 3 11, a microprocessor-controlled control electronics 14, with a setpoint input 12, in which the control signal w is fed which, as will be described later, by a Process controller 5 is specified.
  • the control electronics 14 in turn gives the signals generated by it to the actuators 13, the Control valve drive 15, the valve cone via the spindle 16 30 actuated.
  • the control electronics also have 14 more Inputs for the stroke sensor 11 and possibly also for other sensors.
  • the operating characteristic Q (h) can be measured using the pressure measurements p 1 and p 2 of sensors 7 and 8 the microprocessor or computer circuit of the positioner 6 can be calculated.
  • Fig. 2 shows a similar system as in Fig. 1, only with the difference that a steam boiler 9 is installed instead of the pump 3 is.
  • the temperature T corresponding to the Temperature specification Ts can be regulated.
  • To determine the operating characteristic Q (h) is in the circuit of the pipeline 10 a flow meter 17 is arranged.
  • the operating characteristic Q (h) of such a system is non-linear.
  • the nonlinear operating characteristic Q (h) of the system is therefore determined and converted into a linear function Q ( w ) (FIG. 5).
  • a mechanical or electronic transmission element that acts in a specifically non-linear manner can be connected to the positioner 6.
  • This can be, for example, a correspondingly designed cam disc, the radii of which are designed in such a way that a linearity Q ( w ) arises.
  • the simplest way to obtain the operating characteristic curve Q (h) is by measuring the flow Q as a function of the valve opening h (FIG. 5). However, it can also be done in such a way that the inlet pressure p 1 before the valve 1 and the outlet pressure p 2 immediately after the valve 1 are measured as a function of the valve opening h and taking into account the values from the characteristic curve K v (h) of the valve 1 the operating characteristic Q (h) of the system is determined by calculation.
  • pressure sensors 7 and 8 are integrated in valve 1. Through the connection the pressure sensors 7 and 8 directly with the control electronics 14 experiences the valve 1 and thus the system Self control.
  • the pressures determined are as above mentioned, directly in the computer of the control electronics 14 for further processing directed.
  • valve 4 is a structural design of the valve 1 in Connection to actuator 15 and positioner 6 shown.
  • the valve cone 30 of the valve 1 is over the spindle 16 connected to the valve drive 15, which comes from the drive piston 161 and the return spring 18 consists essentially.
  • the drive piston 161 is used to adjust the valve cone 30 applied via an air connection opening 29 and an air chamber 28.
  • This actuator 15 is directly on the valve 1 centered on the valve spindle 16.
  • the positioner 6 is connected by a control line 36 its outlet opening 37 with the air connection opening 29 of the Actuator 15 connected.
  • About the actuators 13 Air supply in the air chamber 28 for the actuator 15 of the Valve 1 controlled.
  • the positioner 6 is also on this actuator 15 centered on the valve spindle 16. This results in a very compact and simple design without additional transmission parts, that lead to inaccuracies.
  • the between Valve actuator 15 and positioner 6 arranged sight glass 31 with the pointer 32 arranged on the valve spindle 16 a reading of the valve position.
  • the valve stem 16 continues into positioner 6 and contributes a stroke sensor 11 at its upper end.
  • electronic boards 19 are arranged, which also include the microprocessor 14 of the positioner 6 included.
  • the stroke sensor 11 can be designed in various ways.
  • the stroke sensor 11 is preferably a magnetic-inductive one System executed and works without contact. This results in a particularly reliable design because, on the one hand no moving parts, e.g. Lever and the like accessible from the outside secondly, the stroke detection is wear-free and insensitive to vibrations. This is a requirement for precise and exact control and regulation of the valve opening H.
  • FIG. 8 shows the construction and the functional principle in a circuit diagram of the magnetic-inductive stroke sensor 11.
  • Die Extension of the valve spindle 16 carries one at its end Ferrite core 20, which in a coil 33 corresponding to the stroke h of the valve cone 30 is moved up and down. Corresponding its position within the coil 33 becomes a corresponding one Current or voltage generated inductively as a measure of the valve opening H.
  • a special feature of the stroke sensor 11 is that that the coil 33 has a primary winding 25 and two secondary windings 26, the two secondary windings 26 being coaxial arranged in series, but connected to each other.
  • Fig. 9 shows another embodiment of such a contactless working stroke sensor.
  • the stroke sensor 111 works an optical principle.
  • a cover panel 23 is placed at the end of the extended valve stem 16, instead of the ferrite core 20, a cover panel 23 is placed. This cover 23 is tapered so an exactly right-angled adjustment to the beam path of the light is unnecessary.
  • a slit diaphragm 24 is arranged in front of a photocell 22, which through the cover panel 23 corresponding to the lifting movement h the valve stem 16 covered and so that from the photodiode 21 emerging light for the photocell 22 more or less is released.
  • This is analogous to the incidence of light and thus the position of the cover panel 23 is a photoelectric Generates current or voltage, which is also a measure of the valve opening h serves.
  • the cover 23 can also linearize the Function I (h) can be achieved.
  • a particularly expedient version of the stroke sensor 111 exists in a modification of the photocell 22 such that the light rays passing through the slit diaphragm 24 instead of a photocell from a very large number of the smallest individual photo elements - so-called photo bits - that are captured digitally give directly usable signals depending on how many through the position of the cover plate 23 by the photodiode 21st emitted light rays are exposed. These signals can without having to prepare them through digitization, fed directly to the microprocessor 14 for processing become.
  • This type of photoelectric scanning also has the advantage that the measurements are independent of the constant maintenance the light intensity are.
  • the non-contact stroke sensors described can both with advantage when using the initially described Method for linearizing the operating characteristic Q (h) can also be used independently.
  • the described working on inductive as well as optical principles Stroke sensors help linearize the controlled variables when used alone, only for the area of the stroke sensors.
  • FIG 10 is the connection of an electrical transmission element 35 to the positioner 6 shown. That from the process controller 5 coming control signal w passes through in this case only the electrical transmission element 35 before it Input 12 of control electronics 14 of positioner 6 reached. Through the connected transmission element 35 the programmed function h (w) is superimposed on the position signal w, so that the linear function Q (w) arises, which then, as already described above, formed by the control electronics 14.
  • the mechanical transmission element 34 When using a mechanical non-linear transmission element 34 this is convenient between the valve drive 15 and the stroke sensor 11 of the positioner switched on, the mechanical transmission element 34 each is programmed so that the return to the stroke sensor 11 Valve opening h such a value is added that a linear Function Q (w) arises.
  • the nonlinear mechanical Transmission element 34 can be used both as a cam, the Radii are formed in such a way that a linearity Q (w) arises, or as a correspondingly non-linear potentiometer be trained.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Flow Control (AREA)
  • Indication Of The Valve Opening Or Closing Status (AREA)
  • Control Of Fluid Pressure (AREA)
  • Feedback Control In General (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Servomotors (AREA)

Claims (26)

  1. Procédé de commande d'ouverture h d'une vanne intégrée dans une installation, au moyen d'un régulateur de position auquel est transmis un signal de commande w, pour un débit Q souhaité, caractérisé en ce que la caractéristique de fonctionnement Q(h) non linéaire de l'installation est recherchée en déterminant le débit Q en fonction de l'ouverture h de la vanne et en ce que pour les ouvertures respectives h de la vanne le signal w de commande correspondant est déterminé, si bien qu'une fonction w(h) en résulte, que la fonction w(h) ainsi trouvée est superposée à la fonction Q(h), de sorte que les valeurs Q(w) se situent sur une droite, les valeurs du signal w de commande se trouvant sur une droite étant utilisées pour commander la vanne en ce qui concerne le débit Q.
  2. Procédé selon la revendication 1, caractérisé en ce que la détermination du débit Q s'opère par une mesure directe dans l'installation en fonction de l'ouverture h de la vanne.
  3. Procédé selon la revendication 1, caractérisé en ce que la détermination du débit Q s'opère par mesure de la pression (p1) d'entrée avant la vanne et de la pression (p2) de sortie immédiatement après la vanne en fonction de l'ouverture h correspondante de la vanne, et que ces valeurs sont transmises à un calculateur en tenant compte des valeurs résultant de la ligne caractéristique Kv(h) de la vanne (1), calculateur qui détermine la fonction h(w) à partir des valeurs mesurées (p1, p2; Q) et la transmet à un microprocesseur (14) du régulateur de position (6).
  4. Procédé selon la revendication 3, caractérisé en ce que les valeurs mesurées (p1, p2; Q) sont transmises à un calculateur pour y être traitées, calculateur qui détermine la fonction h(w) à partir des valeurs mesurées (p1, p2; Q) et la transmet au microprocesseur (14) du régulateur de position (6).
  5. Dispositif pour commander l'ouverture h d'une vanne (1) intégrée dans une installation, cette installation comportant une résistance de consommation (2) et des dispositifs (3 ; 9) provoquant l'écoulement d'un agent dans l'installation, la vanne (1) étant actionnée à l'aide d'un régulateur de position (6) qui comporte un capteur (11 ; 111) pour saisir l'ouverture actuelle h de la vanne, une entrée (12) de la valeur de consigne pour un signal de commande w ainsi que des actionneurs (13) pour entraíner le mécanisme de commande (15) de la vanne et un circuit à microprocesseur, caractérisé en ce que des moyens (7, 8 ; 17) sont prévus pour déterminer la quantité Q de l'agent traversant l'installation en fonction de l'ouverture h de la vanne et en ce que le régulateur (6) de position est pourvu d'un équipement électronique (14) pour la régulation qui attribue ces valeurs Q(h) à respectivement un signal de commande w prédéterminé, ce signal de commande w étant transformé, pour la commande de la vanne (1), en une telle ouverture h de la vanne qu'une fonction Q(w) linéaire est obtenue.
  6. Dispositif selon la revendication 5, caractérisé en ce qu'en amont et en aval de la vanne (1) des capteurs de pression (7, 8) sont disposés.
  7. Dispositif selon la revendication 6, caractérisé en ce que les capteurs de pression (7, 8) sont intégrés dans la vanne (1).
  8. Dispositif selon l'une des revendications 5 ou 6, caractérisé en ce que l'équipement électronique (14) du régulateur de position (6) est relié avec les capteurs de pression (7, 8) et qu'il évalue les pressions (p1, p2) mesurées lors de la commande de la vanne (1) pour déterminer la caractéristique de fonctionnement Q(h) de l'installation.
  9. Dispositif selon la revendication 5, caractérisé en ce que pour l'agent passant à travers l'installation une conduite (10) est prévue dans laquelle un débitmètre (17) est disposé.
  10. Dispositif selon la revendication 5, caractérisé en ce qu'un débitmètre (17) est intégré dans la vanne (1).
  11. Dispositif selon l'une ou plusieurs des revendications 5 à 10, caractérisé en ce qu'au régulateur de position 6 il est raccordé un élément de transmission (34 ; 35) mécanique ou électronique agissant explicitement de façon non linéaire qui est conçu de telle façon que le signal de commande w transmis au régulateur de position (6) est transformé en une telle ouverture h de la vanne qu'une fonction Q(w) linéaire est obtenue.
  12. Dispositif selon la revendication 11, caractérisé en ce que l'élément de transmission (34) mécanique est situé entre le mécanisme de commande (15) de la vanne et un capteur de course (11) indiquant l'ouverture h de la vanne.
  13. Dispositif selon l'une des revendications 11 ou 12, caractérisé en ce que l'élément de transmission (34) mécanique est conçu comme came dont les rayons sont conformés de telle manière qu'une linéarité Q(w) est obtenue.
  14. Dispositif selon la revendication 11, caractérisé en ce que l'élément de transmission (35) électrique est placé en amont de l'équipement électronique (14) du régulateur de position (6) et est programmé de telle manière qu'une linéarité Q(w) est obtenue.
  15. Dispositif selon l'une ou plusieurs des revendications 5 à 14, caractérisé en ce que la vanne (1) comporte un mécanisme de commande (15) de la vanne agissant sur la broche (16) de la vanne, dans la prolongation axiale du mécanisme de commande étant disposé le régulateur de position (6), de façon centrée par rapport à la broche (16) de la vanne.
  16. Dispositif selon l'une ou plusieurs des revendications 5 à 15, caractérisé en ce que le régulateur de position (6) dispose d'un capteur de course (11; 111) fonctionnant sans contact et qui saisit l'ouverture h de la vanne.
  17. Dispositif selon la revendication 16, caractérisé en ce que le capteur de course (11) fonctionne de façon magnéto-inductive.
  18. Dispositif selon la revendication 17, caractérisé en ce que le capteur de course (11) contient une bobine (33) dans laquelle plonge un noyau en ferrite (20) en fonction du mouvement de commande pour l'ouverture h de la vanne ; la bobine comprenant un enroulement primaire (25) et deux enroulements secondaires (26), les deux enroulements secondaires (26) étant montés en série de façon coaxiale.
  19. Dispositif selon la revendication 18, caractérisé en ce que le noyau en ferrite (20) est positionné à l'intérieur de la bobine (33) en fonction du mouvement de commande pour l'ouverture h de la vanne.
  20. Dispositif selon l'une des revendications 18 ou 19, caractérisé en ce que les deux enroulements secondaires (26) sont montés en opposition, si bien que lorsque le noyau en ferrite (20) se trouve dans une position symétrique par rapport aux deux enroulements secondaires (26), l'induction est supprimée.
  21. Dispositif selon la revendication 16, caractérisé en ce que le capteur de course (111) contient une photodiode (21), un écran de recouvrement (23) mobile accouplé à la broche (16) de la vanne ainsi que des moyens captant les rayons lumineux émis par la photodiode (21).
  22. Dispositif selon la revendication 21, caractérisé en ce que l'écran de recouvrement (23) est disposé au bout de la broche (16) prolongée de la vanne et qu'il coopère avec un diaphragme à fente (24).
  23. Dispositif selon l'une ou plusieurs de revendications 21 ou 22, caractérisé en ce que l'écran de recouvrement (23) est conçu avec une symétrie de révolution.
  24. Dispositif selon l'une ou plusieurs des revendications 21 à 23, caractérisé en ce que la génératrice de l'écran de recouvrement (23) est conçue de telle manière qu'une linéarisation du courant I, produit par la position de l'écran de recouvrement (23), en fonction de l'ouverture de vanne h est obtenue [fonction I(h)].
  25. Dispositif selon l'une ou plusieurs des revendications 21 à 24, caractérisé en ce qu'à la place d'une cellule photoélectrique (22) captant les rayons lumineux de la photodiode (21), on a une cellule photoélectrique qui est divisée en un très grand nombre d'éléments photoélectriques individuels minuscules (photobits) qui émettent des signaux numériques directement utilisables.
  26. Dispositif selon la revendication 25, caractérisé en ce que les photobits sont raccordés au microprocesseur (14) du régulateur de position (6).
EP96117147A 1995-10-27 1996-10-25 Régulateur de position contrôlé par microprocesseur Expired - Lifetime EP0782060B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19540441A DE19540441A1 (de) 1995-10-27 1995-10-27 Mikroprozessorgesteuerter Stellungsregler
DE19540441 1995-10-27

Publications (2)

Publication Number Publication Date
EP0782060A1 EP0782060A1 (fr) 1997-07-02
EP0782060B1 true EP0782060B1 (fr) 2002-04-10

Family

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EP96117147A Expired - Lifetime EP0782060B1 (fr) 1995-10-27 1996-10-25 Régulateur de position contrôlé par microprocesseur

Country Status (5)

Country Link
US (1) US5878765A (fr)
EP (1) EP0782060B1 (fr)
AT (1) ATE216094T1 (fr)
DE (2) DE19540441A1 (fr)
ES (1) ES2172614T3 (fr)

Cited By (1)

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DE102014117988A1 (de) * 2014-12-05 2016-06-09 Pierburg Gmbh Verfahren zur Kalibrierung eines Regelventils

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EP1445676B1 (fr) * 1997-07-23 2008-05-21 Dresser, Inc. Système de positionnement d'une vanne
US6272401B1 (en) 1997-07-23 2001-08-07 Dresser Industries, Inc. Valve positioner system
US6192321B1 (en) * 1997-09-29 2001-02-20 Fisher Controls International, Inc. Method of and apparatus for deterministically obtaining measurements
AUPP512398A0 (en) 1998-08-07 1998-09-03 Resmed Limited A control member for a valve and method for determining fluid flow rate through a valve
DE19960190A1 (de) * 1999-12-14 2001-07-05 Bosch Gmbh Robert Regelventil
ES2180398B1 (es) * 2000-12-11 2004-03-01 Almela Jesus Martinez Sistema para el control del caudal a traves de una conduccion.
EP1457856B1 (fr) * 2001-04-24 2005-11-23 Celerity Group, Inc. Procédé pour déterminer l'ouverture d'une soupape pour un régulateur numérique de débit massique
ATE310986T1 (de) * 2001-04-24 2005-12-15 Celerity Group Inc Verfahren zur bestimmung einer ventilöffnung für einen massenflussregler
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DE59609055D1 (de) 2002-05-16
US5878765A (en) 1999-03-09
DE19540441A1 (de) 1997-04-30
ES2172614T3 (es) 2002-10-01
ATE216094T1 (de) 2002-04-15
EP0782060A1 (fr) 1997-07-02

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